The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 29, 2011
Filed:
Nov. 12, 2004
Arun Raghupathy, San Diego, CA (US);
Puay Hoe See, San Diego, CA (US);
Gurkanwal Kamal Sahota, San Diego, CA (US);
Robert Reeves, Escondido, CA (US);
Paul E. Peterzell, Plantation, FL (US);
Arun Raghupathy, San Diego, CA (US);
Puay Hoe See, San Diego, CA (US);
Gurkanwal Kamal Sahota, San Diego, CA (US);
Robert Reeves, Escondido, CA (US);
Paul E. Peterzell, Plantation, FL (US);
QUALCOMM, Incorporated, San Diego, CA (US);
Abstract
Methods and apparatus for amplifier AM and PM predistortion and autocalibration. AM and PM amplifier distortion can be corrected using predistortion. The AM and PM distortion characteristics of the amplifier are determined using an autocalibration technique. The amplifier characteristics can be stored in distinct look up tables. Alternatively, the inverse of the amplifier characteristics can be stored in distinct look up tables. Signals that are to be amplified are characterized in polar format having a phase component with a normalized magnitude and a magnitude component. The phase component can be predistorted by applying the inverse of the PM distortion characteristics to the signal. Similarly, the magnitude component can be predistorted by applying the inverse of the AM distortion characteristics to the signal. The predistorted phase component can be amplified using the previously characterized amplifier. The predistorted magnitude component can be used to set the gain of the previously characterized amplifier.